La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Do global models predicting environmental suitability for the amphibian fungus, Batrachochytrium dendrobatidis, have local value to conservation managers?
Auteurs :	Karen Riley, Auteur ; Oliver F. Berry, Auteur ; J. Dale Roberts, Auteur
Type de document :	Article
Dans :	Journal of Applied Ecology (50(3) JUN 2013)
Article en page(s) :	713-720
Langues:	Anglais
Résumé :	The amphibian chytrid fungus Batrachochytrium dendrobatidis is a major cause of frog declines globally. Two recent Maxent models predict high environmental suitability for B.dendrobatidis in south-western Australia despite severe summer drought and many frog species with direct development or breeding in ephemeral water bodies: features often associated with absence of B.dendrobatidis. We determined B.dendrobatidis occurrence and intensity of infection, in 15 populations of Crinia georgiana, a frog that breeds in ephemeral ponds, to assess (i) current validity of claims about environmental suitability, (ii) risk of decline against recent suggestions of 100% prevalence and chytrid loads of>10000 zoospore equivalents per frog as predictors of imminent decline and (iii) assess apparent change in prevalence over 20years. Batrachochytrium dendrobatidis occurred on 40100% of frogs at all sites and in water samples at 11 sites but infection levels were generally well below 10000 zoospore equivalents per frog. Based on immediate and 5-year climate averages, higher rainfall, more rain days and temperatures>3 degrees C but

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